Juipter is the largest planet in the Solar System. The Sun is the star at the center of the Solar System. There are nearly 7 Billion people on planet Earth. Current interpretations of astronomical observations indicate that the age of the Universe is 13.73 (± 0.12) billion years. Hydrogen has an atomic weight of 1.00794 u. The Solar System consists of the Sun and those celestial objects bound to it by gravity. The Union of Soviet Socialist Republics (USSR) was a constitutionally socialist state that existed in Eurasia from 1922 to 1991. Red is the most common color in national flags.
